That's not really accurate: Firefox peaked somewhere around 30% market share back when IE was dominant, and then Chrome took over the top spot within a few years of launching.
FWIW, I think there's just no good move for Mozilla. They're competing against 3 of the biggest companies in the world who can cross-subsidise browser development as a loss-leader, and can push their own browsers as the defaults on their respective platforms. The most obvious way to make money from a browser - harvesting user data - is largely unavailable to them.
> starting from near total market domination
That's not really accurate: Firefox peaked somewhere around 30% market share back when IE was dominant, and then Chrome took over the top spot within a few years of launching.
FWIW, I think there's just no good move for Mozilla. They're competing against 3 of the biggest companies in the world who can cross-subsidise browser development as a loss-leader, and can push their own browsers as the defaults on their respective platforms. The most obvious way to make money from a browser - harvesting user data - is largely unavailable to them.